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प्रश्न
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
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उत्तर
No. Electromagnets can only attract magnetic materials. A plastic bag is a non-magnetic material and will not be attracted by an electromagnet. Hence, an electromagnet cannot be used to separate plastic bags from a garbage heap.
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संबंधित प्रश्न
An electric bell has an electromagnet.
Fill in the following blank with suitable words:
If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.
The magnetic effect of current was discovered by:
(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday
For the coil in the diagram below, when the switch is pressed:
(a) what is the polarity of end A?
(b) which way will the compass point then?
A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the N-pole is removed?
A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the magnet is a rest in the coil?
Write the correct option by observing the figures.
Observe the following diagram and choose the correct alternative:
(ii) Global warming is a desirable aspect of the intensified greenhouse effect.
Make four electromagnets with 20, 40, 60 and 80 turns. Connect them one by one to a battery of 2 cells. Bring the electromagnet near a box of pins. Count the number of pins attracted by it. Compare the strengths of the electromagnets.
